JPH0234083B2 - - Google Patents
Info
- Publication number
- JPH0234083B2 JPH0234083B2 JP57205177A JP20517782A JPH0234083B2 JP H0234083 B2 JPH0234083 B2 JP H0234083B2 JP 57205177 A JP57205177 A JP 57205177A JP 20517782 A JP20517782 A JP 20517782A JP H0234083 B2 JPH0234083 B2 JP H0234083B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording
- head
- film
- magnetic pole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000010408 film Substances 0.000 claims description 19
- 239000010409 thin film Substances 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 claims description 5
- 238000009499 grossing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 229910000889 permalloy Inorganic materials 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 5
- 230000008929 regeneration Effects 0.000 description 5
- 238000011069 regeneration method Methods 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical class [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- 229910000684 Cobalt-chrome Inorganic materials 0.000 description 2
- 239000010952 cobalt-chrome Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 210000002966 serum Anatomy 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】 本発明は磁気記録の記録再生方式に関する。[Detailed description of the invention] The present invention relates to a recording/reproducing method for magnetic recording.
従来磁気記録は、媒体を長手方向に磁化して情
報を記録する長手磁気記録再生方式であつたが、
近年媒体をその厚み方向に磁化して情報を記録す
る垂直磁気記録方式が提案され、長手磁気記録再
生方式より高密度化が容易であることが理論的に
も実験的にも明らかになつて来た。 Conventional magnetic recording was a longitudinal magnetic recording/reproducing method in which information was recorded by magnetizing the medium in the longitudinal direction.
In recent years, a perpendicular magnetic recording method has been proposed in which information is recorded by magnetizing the medium in the direction of its thickness, and it has become clear both theoretically and experimentally that it is easier to achieve higher density than the longitudinal magnetic recording and reproducing method. Ta.
媒体に対し情報の記録・再生を行なう電磁変換
素子である磁気ヘツドも、従来の長手磁気記録方
式で用いられているリング型ヘツドの他に、新た
に垂直磁気記録用の単磁極ヘツドと呼ばれる磁気
ヘツドが発明された。 Magnetic heads, which are electromagnetic transduction elements that record and reproduce information on and from media, include ring-type heads used in conventional longitudinal magnetic recording systems, as well as magnetic heads called single-pole heads for perpendicular magnetic recording. The head was invented.
第１図に単磁極ヘツドによる垂直磁気記録系の
代表的例を図式的に示す。垂直磁気記録のための
媒体１は基板４上に軟磁性層３と垂直磁化膜（記
録層）２を重ねた構造になつている。 FIG. 1 schematically shows a typical example of a perpendicular magnetic recording system using a single magnetic pole head. A medium 1 for perpendicular magnetic recording has a structure in which a soft magnetic layer 3 and a perpendicular magnetization film (recording layer) 2 are stacked on a substrate 4.
磁気ヘツドは、軟磁性体薄膜からなる単磁極
（主磁極）５と巻線６、及び単磁極と巻線の磁気
的伝達効率を向上させるための軟磁性体ブロツク
７からなる。この様な単磁極が媒体に垂直に対向
する形状のヘツドは、非常に高い密度まで情報を
書き込むことができる（記録分解能が高い）が、
再生効率が低いという欠点を有する。 The magnetic head consists of a single magnetic pole (main magnetic pole) 5 made of a soft magnetic thin film, a winding 6, and a soft magnetic block 7 for improving the magnetic transmission efficiency between the single magnetic pole and the winding. A head with such a single magnetic pole facing perpendicularly to the medium can write information to a very high density (high recording resolution), but
It has the disadvantage of low regeneration efficiency.
第２図は、ポリエチレンテレフタレートのシー
ト上に軟磁性体層としてパーマロイを、垂直磁化
膜としてコバルト・クロム合金をそれぞれスパツ
タリング法により形成して作つた垂直磁気記録媒
体に対し、単磁極ヘツドで記録を行なつた後、リ
ング型ヘツドで再生した場合(A)、及び単磁極ヘツ
ドで再生した場合(B)について、記録密度を横軸に
とり、規格化された再生出力を縦軸にとつて示し
たものである。なお、単磁極ヘツドの厚み及びリ
ング型ヘツドのギヤツプ長はともに1μｍである。
低密度側（左側）の再生出力値で比較してリング
型ヘツドの再生出力は、同一トラツク幅、同一巻
線数の単磁極ヘツドのそれより10倍程度大きくな
つている。 Figure 2 shows a perpendicular magnetic recording medium made by sputtering a permalloy soft magnetic layer and a cobalt-chromium alloy perpendicular magnetization film on a sheet of polyethylene terephthalate, and recording with a single magnetic pole head. The horizontal axis shows the recording density and the vertical axis shows the normalized playback output for the case of playback with a ring type head (A) and the case of playback with a single magnetic pole head (B). It is something. The thickness of the single magnetic pole head and the gap length of the ring type head are both 1 μm.
Comparing the reproduction output values on the low density side (left side), the reproduction output of the ring type head is about 10 times greater than that of a single magnetic pole head with the same track width and the same number of windings.
次に第３図はコバルト・クロムからなる記録層
の垂直異方性磁界を横軸にとり、再生出力が低密
度側のそれの半分になる記録密度D50を縦軸にと
つて両者の関係を示したものである。D50は第２
図中点線と矢印で示した記録密度である。第３図
でＡはリング型ヘツドで記録した場合、Ｂは単磁
極ヘツドで記録した場合である。なお、単磁極ヘ
ツドの厚み、及びリング型ヘツドのギヤツプ長は
ともに1μｍである。再生は共通のヘツドで行な
つており、ＡとＢの差違は媒体に記録された磁化
パタンの差に起因するものである。即ちリング型
ヘツドは高密度側の記録性能が単磁極ヘツドより
劣つている（記録分解能が悪い）。 Next, Figure 3 shows the relationship between the two, with the horizontal axis representing the perpendicular anisotropic magnetic field of the cobalt-chromium recording layer, and the vertical axis representing the recording density D 50 , where the reproduction output is half of that on the lower density side. This is what is shown. D 50 is the second
This is the recording density shown by the dotted line and arrow in the figure. In FIG. 3, A shows the case where recording is performed with a ring type head, and B shows the case where recording is performed with a single magnetic pole head. The thickness of the single magnetic pole head and the gap length of the ring type head are both 1 μm. Reproduction is performed using a common head, and the difference between A and B is due to the difference in the magnetization pattern recorded on the medium. That is, the ring type head is inferior to the single magnetic pole head in recording performance on the high density side (poor recording resolution).
しかも、より重要なことは記録層の垂直異方性
磁界の低下によりリング型ヘツドの記録分解能は
低下する。一方単磁極ヘツドにおいてはこの低下
はわずかである。このことはリング型ヘツドで高
密度記録を行なうためには垂直異方性磁界が非常
に大きい記録層が必要であることを示している。
垂直異方性磁界の大きい“良い”媒体を得るには
製造上の制約が大きく、この点においては垂直異
方性磁界の小さくて済む単磁極ヘツドが有利であ
る。 Moreover, more importantly, the recording resolution of the ring head decreases due to the decrease in the perpendicular anisotropy magnetic field of the recording layer. On the other hand, in a single-pole head, this decrease is slight. This indicates that a recording layer with a very large perpendicular anisotropy field is required in order to perform high-density recording with a ring-type head.
In order to obtain a "good" medium with a large perpendicular anisotropy field, there are significant manufacturing constraints, and in this respect, a single-pole head that requires a small perpendicular anisotropy field is advantageous.
しかし、第１図の単磁極ヘツドは媒体を両面か
ら挾む構成になつており、基板が厚いハード・デ
イスク装置や、磁気ヘツドがシリンダとともに回
転するビデオ・テープ装置等には使用できない。 However, the single magnetic pole head shown in FIG. 1 is configured to sandwich the medium from both sides, and cannot be used in hard disk drives with thick substrates, video tape drives in which the magnetic head rotates together with the cylinder, and the like.
本発明は前述したような、単磁極ヘツド、リン
グ型ヘツドによる従来の垂直磁気記録再生方式の
欠点を解消し、高記録分解能、高再生効率の磁気
記録再生方式を提供するものである。 The present invention eliminates the drawbacks of the conventional perpendicular magnetic recording/reproducing system using a single magnetic pole head or a ring type head, as described above, and provides a magnetic recording/reproducing system with high recording resolution and high reproducing efficiency.
第４図は本発明の概念を説明するための図であ
る。磁気ヘツドは同図に示す様に、リング型の閉
磁路構造を有する磁性体８と巻線６で構成され、
磁極８は垂直磁気記録媒体１に対向する側に微小
なギヤツプ９を有する。更に磁極の一稜線１０は
明確に角付けされ媒体１に対向している。磁気ヘ
ツドは同図の右の方向へ媒体に対し相対的に移動
して記録再生を行なう。即ち稜線１０がトレーリ
ング・エツジとなる。 FIG. 4 is a diagram for explaining the concept of the present invention. As shown in the figure, the magnetic head is composed of a magnetic body 8 having a ring-shaped closed magnetic circuit structure and a winding 6.
The magnetic pole 8 has a small gap 9 on the side facing the perpendicular magnetic recording medium 1 . Furthermore, one edge line 10 of the magnetic pole is clearly angled and faces the medium 1. The magnetic head performs recording and reproduction by moving relative to the medium toward the right in the figure. That is, the ridgeline 10 becomes a trailing edge.
第５図にリング型ヘツド、単磁極ヘツド、本発
明の方式で用いる第４図の磁気ヘツドの作る書込
み磁界を、それぞれア，イ，ウとして模式的に示
した。同図中斜線部が磁極で９はギヤツプであ
る。リング型ヘツドの書き込み磁界が円弧状であ
るのに対し、単磁極ヘツドは水平成分の少い、垂
直記録に適した書き込み磁界を発生する。ウの磁
気ヘツドの稜線１０近傍の書き込み磁界は単磁極
ヘツドのそれに類似しており、媒体が最後に経験
する書き込み磁界は稜線１０近傍の磁界であるか
ら、第４図の磁気ヘツドにより単磁極ヘツド並の
記録分解能が得られる。 FIG. 5 schematically shows the write magnetic fields generated by a ring type head, a single magnetic pole head, and the magnetic head shown in FIG. 4 used in the method of the present invention as A, A, and C, respectively. In the figure, the shaded area is a magnetic pole, and 9 is a gap. While the write magnetic field of a ring type head is arc-shaped, a single magnetic pole head generates a write magnetic field suitable for perpendicular recording with less horizontal component. The write magnetic field near the ridge line 10 of the magnetic head shown in FIG. Average recording resolution can be obtained.
次に本発明の方式における再生（読み出し）は
ギヤツプ９を介して、リング型ヘツドと同様に行
なわれる。従つてリング型ヘツドの高い再生効率
が得られる。 Next, reproduction (reading) in the system of the present invention is performed via the gap 9 in the same manner as in the ring type head. Therefore, a high regeneration efficiency of the ring type head can be obtained.
次に本発明を実施例に基づき更に詳しく説明す
る。第６図は磁気ヘツドの説明図である。先ずト
レーリング側のフエライト１１にセラミツク材
（フオトセラム）１２を接着し図の様な形状に切
断した後、研磨した面に厚さ2μｍの二酸化ケイ
素膜１３をスパツタリング法によつて形成し、更
に4.5μｍ厚のパーマロイ膜１４を形成する。二酸
化ケイ素膜１３はパーマロイ膜１４をスパツタリ
ングする基板を平滑にするためのものである。次
いでリーデイング側のフエライト１５を接着す
る。ギヤツプ長１６は所望の再生分解能から決め
られるが本実施例では0.4μｍである。最後に媒体
に対向する面を研磨し、パーマロイ膜のフエライ
ト１１からの突き出し長さ１７及びギヤツプ深さ
１８を15μｍ以下にした。パーマロイ膜厚みは、
１リング型ヘツドとしての再生効率、２稜線１０
近傍における書込み磁界発生効率と３再生時にパ
ーマロイ膜が単磁極として作動してギヤツプによ
る再生出力を乱さないことを考慮して決められ
る。このヘツドでコバルト・クロム記録層厚0.4μ
ｍ、軟磁性体層厚1μｍの媒体に記録再生を行な
つたところ、同じ再生分解能を有する単磁極厚み
0.4μｍの単磁極ヘツドに比較して記録分解能の点
ではほぼ同等であり、再生効率では約１桁向上し
た。第６図におけるパーマロイ薄膜１４、フエラ
イト１１及びフエライト１５の三者が第４図に示
す閉磁体８を構成しており、再生時には記録媒体
から漏れ出た磁束は閉磁路構造の磁性体を通り、
再度記録媒体に流入する。磁束は記録媒体に記録
された磁化パターンに依存して、閉磁路構造の磁
性体を通化する時磁束密度が変化し、変化した磁
束密度は巻線６によつて再生される。 Next, the present invention will be explained in more detail based on examples. FIG. 6 is an explanatory diagram of the magnetic head. First, a ceramic material (photoceram) 12 is bonded to the ferrite 11 on the trailing side and cut into the shape shown in the figure. A silicon dioxide film 13 with a thickness of 2 μm is formed on the polished surface by sputtering, and then a 4.5 μm thick silicon dioxide film 13 is formed on the polished surface by sputtering. A permalloy film 14 with a thickness of μm is formed. The silicon dioxide film 13 is for smoothing the substrate on which the permalloy film 14 is sputtered. Next, the ferrite 15 on the leading side is bonded. The gap length 16 is determined based on the desired reproduction resolution, and in this embodiment, it is 0.4 μm. Finally, the surface facing the medium was polished so that the protruding length 17 of the permalloy film from the ferrite 11 and the gap depth 18 were 15 μm or less. Permalloy film thickness is
Regeneration efficiency as a 1-ring type head, 2 ridges 10
It is determined in consideration of the writing magnetic field generation efficiency in the vicinity and the fact that the permalloy film operates as a single magnetic pole during the third reproduction so that the reproduction output is not disturbed by the gap. With this head, the cobalt-chromium recording layer thickness is 0.4μ.
m, When recording and reproducing on a medium with a soft magnetic layer thickness of 1 μm, the single magnetic pole thickness with the same reproduction resolution
Compared to a 0.4 μm single-pole head, the recording resolution is almost the same, and the reproduction efficiency is improved by about an order of magnitude. The permalloy thin film 14, ferrite 11, and ferrite 15 in FIG. 6 constitute the closed magnetic body 8 shown in FIG. 4, and during reproduction, the magnetic flux leaking from the recording medium passes through the magnetic body with a closed magnetic path structure.
It flows into the recording medium again. Depending on the magnetization pattern recorded on the recording medium, the magnetic flux density changes when the magnetic body of the closed magnetic path structure is passed through, and the changed magnetic flux density is reproduced by the winding 6.
以上の様に、本発明によれば、第１コア部と非
磁性体の平面上に薄膜を形成することにより、コ
ア部より透磁率の高い磁性体膜を容易に平滑形成
することができるため、磁気洩れを発生すること
なしにトレーリング側のコア部のエツジ近傍に高
密度の磁界を効率良く発生することができ、高密
度の垂直磁気記録をすることができる。又、再生
時には、ギヤツプを介して高再生効率を得ること
ができる。 As described above, according to the present invention, by forming a thin film on the plane of the first core part and the nonmagnetic material, it is possible to easily form a smooth magnetic film having higher magnetic permeability than the core part. , a high-density magnetic field can be efficiently generated near the edge of the core portion on the trailing side without causing magnetic leakage, and high-density perpendicular magnetic recording can be performed. Furthermore, during regeneration, high regeneration efficiency can be obtained through the gap.
尚、薄膜なしにコア部に直接磁性膜を形成した
場合、又、機械的加工により平滑度を出した場合
でも、磁性膜のコア部表面近傍の原子の並びがコ
ア部からの影響を受け、磁性膜の磁気特性が悪く
なるという問題点がある。一方本発明では、上述
の如く平滑用の薄膜と磁性膜を順次重ねて配置す
ることにより、これら問題点を全く解決し、量産
性にすぐれ、且つ、高密度記録、高効率再生を行
なうことができる磁気記録再生装置を提供するも
のである。 In addition, even if a magnetic film is formed directly on the core without a thin film, or even if smoothness is achieved by mechanical processing, the arrangement of atoms near the surface of the core of the magnetic film is influenced by the core. There is a problem that the magnetic properties of the magnetic film deteriorate. On the other hand, in the present invention, by arranging the smoothing thin film and the magnetic film in sequence as described above, these problems are completely solved, and it is possible to achieve high mass productivity, high density recording, and high efficiency reproduction. The purpose of the present invention is to provide a magnetic recording and reproducing device that can perform the following functions.
第１図は単磁極ヘツドによる垂直磁気記録再生
方式の説明図。第２図はＡリング型ヘツド及びＢ
単磁極ヘツドによる再生出力の記録密度特性。第
３図はＡリング型ヘツド及びＢ単磁極ヘツドによ
る記録分解能の垂直異方性磁界依存性。第４図は
本発明の垂直磁気記録再生方式の概念図。第５図
はアリング型ヘツド、イ単磁極ヘツド及びウ本発
明の方式における磁気ヘツドの書き込み磁界の模
式図。第６図は本発明の実施例における磁気ヘツ
ドの説明図。
１……垂直磁気記録媒体、２……垂直磁化膜
（記録層）、３……軟磁性体層、４……基板、５…
…単磁極、６……巻線、７……軟磁性体ブロツ
ク、８……閉磁路構造の磁性体、９……ギヤツ
プ、１０……トレーリング・エツジとなる稜線、
１１……フエライト、１２……フオトセラム、１
３……二酸化ケイ素、１４……パーマロイ、１５
……フエライト、１６……ギヤツプ長、１７……
突き出し長さ、１８……ギヤツプ深さ。
FIG. 1 is an explanatory diagram of a perpendicular magnetic recording and reproducing system using a single magnetic pole head. Figure 2 shows the A-ring type head and B
Recording density characteristics of playback output from a single magnetic pole head. Figure 3 shows the dependence of the recording resolution on the perpendicular anisotropic magnetic field by the A-ring type head and the B single-pole head. FIG. 4 is a conceptual diagram of the perpendicular magnetic recording and reproducing system of the present invention. FIG. 5 is a schematic diagram of the write magnetic field of a ring type head, a single magnetic pole head, and a magnetic head according to the method of the present invention. FIG. 6 is an explanatory diagram of a magnetic head in an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Perpendicular magnetic recording medium, 2... Perpendicular magnetization film (recording layer), 3... Soft magnetic layer, 4... Substrate, 5...
...Single magnetic pole, 6... Winding wire, 7... Soft magnetic material block, 8... Magnetic material with closed magnetic circuit structure, 9... Gap, 10... Ridge line serving as trailing edge,
11... Ferrite, 12... Photo serum, 1
3...Silicon dioxide, 14...Permalloy, 15
...Ferrite, 16...Gap length, 17...
Protrusion length, 18...gap depth.
Claims (1)
気記録媒体に垂直磁気記録する磁気記録再生装置
において、 リング形ヘツドのトレーリング側にある第１コ
ア部の前記記録媒体に対向する面に非磁性材を固
着し、且つ、前記非磁性材端面とリーデイング側
にある第２コア部の端面とをほぼ同一高さに設定
してなり、更に前記第１コア部と前記非磁性材の
前記第２コア部と対向する面を前記記録媒体面と
ほぼ垂直な方向の平面に形成し、該第１コア部と
前記非磁性材の平面上に平滑用の薄膜と磁性膜と
を薄膜形成により順次積層して配置してなり、前
記磁性膜と前記第２コア部の間にギヤツプを形成
し前記磁性膜をトレーリング側の磁極となした磁
気記録再生装置。[Scope of Claims] 1. In a magnetic recording and reproducing device that performs perpendicular magnetic recording on a magnetic recording medium using a ring-shaped head around which a coil is wound, a first core portion on the trailing side of the ring-shaped head faces the recording medium. a non-magnetic material is fixed to the surface of the second core, and the end face of the non-magnetic material and the end face of the second core part on the leading side are set at substantially the same height, and further, the first core part and the non-magnetic A surface of the material facing the second core portion is formed in a plane substantially perpendicular to the surface of the recording medium, and a smoothing thin film and a magnetic film are provided on the plane of the first core portion and the non-magnetic material. 1. A magnetic recording/reproducing device which is formed by sequentially laminating thin films and having a gap formed between the magnetic film and the second core portion, and the magnetic film serving as a trailing side magnetic pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20517782A JPS5996517A (en) | 1982-11-22 | 1982-11-22 | Magnetic recording and reproducing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20517782A JPS5996517A (en) | 1982-11-22 | 1982-11-22 | Magnetic recording and reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5996517A JPS5996517A (en) | 1984-06-04 |
| JPH0234083B2 true JPH0234083B2 (en) | 1990-08-01 |
Family
ID=16502694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20517782A Granted JPS5996517A (en) | 1982-11-22 | 1982-11-22 | Magnetic recording and reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5996517A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4839761A (en) * | 1987-07-31 | 1989-06-13 | Seagate Technology, Inc. | Magnetic head for perpendicular magnetic recording system |
| US4982301A (en) * | 1987-10-30 | 1991-01-01 | Seagate Technology, Inc. | Magnetic head for perpendicular magnetic recording system and process |
| US5396391A (en) * | 1990-12-12 | 1995-03-07 | Kabushiki Kaisha Toshiba | Magnetic recording system providing a magnetic head having opposite sides for applying different magnetic field strengths to a magnetic recording medium |
| US5659446A (en) * | 1990-12-12 | 1997-08-19 | Kabushiki Kaisha Toshiba | Magnetic recording system providing a magnetic head having opposite sides for applying different magnetic field strengths to a magnetic recording medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57210415A (en) * | 1981-06-19 | 1982-12-24 | Matsushita Electric Ind Co Ltd | Magnetic head |
-
1982
- 1982-11-22 JP JP20517782A patent/JPS5996517A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57210415A (en) * | 1981-06-19 | 1982-12-24 | Matsushita Electric Ind Co Ltd | Magnetic head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5996517A (en) | 1984-06-04 |
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